Straight from the horse's mouth:

Russian National And Bitcoin Exchange Charged In 21-Count Indictment For Operating Alleged International Money Laundering Scheme And Allegedly Laundering Funds From Hack Of Mt. Gox
https://www.justice.gov/usao-ndca/pr/russian-national-and-bitcoin-exchange-charged-21-count-indictment-operating-alleged

I can't see Putin or the Russians not doing anything in retaliation for this arrest.

I don't see this as a big deal for Russia authorities